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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2024 metamuffin <metamuffin.org>
*/
use anyhow::{anyhow, Context, Result};
use jellybase::{cache::async_cache_memory, CONF};
use jellycommon::{stream::StreamSpec, LocalTrack, Node};
use jellyremuxer::extract::extract_track;
use jellytranscoder::subtitles::{parse_subtitles, write_webvtt};
use tokio::io::{AsyncWriteExt, DuplexStream};
pub async fn vtt_stream(
json: bool,
node: Node,
local_tracks: Vec<LocalTrack>,
spec: StreamSpec,
mut b: DuplexStream,
) -> Result<()> {
// TODO cache
// TODO should use fragments too? big films take too long...
let tracki = *spec.track.first().ok_or(anyhow!("no track selected"))?;
let local_track = local_tracks.first().ok_or(anyhow!("no tracks"))?.clone();
let track = &node.public.media.unwrap().tracks[tracki];
let cp = local_track.codec_private.clone();
let subtitles = async_cache_memory(
&[
"vtt",
&format!(
"{} {}",
local_track.path.to_str().unwrap(),
local_track.track
),
],
move || async move {
let blocks = tokio::task::spawn_blocking(move || {
extract_track(CONF.media_path.clone(), local_track)
})
.await??;
let subtitles = parse_subtitles(&track.codec, cp, blocks)?;
Ok(subtitles)
},
)
.await?;
let output = if json {
serde_json::to_string(subtitles.as_ref())?
} else {
write_webvtt(
node.public.title.clone().unwrap_or_default(),
subtitles.as_ref(),
)
.context("writing webvtt")?
};
tokio::task::spawn(async move {
let _ = b.write_all(output.as_bytes()).await;
});
Ok(())
}
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